DIAGNOSTIC MANUAL
Operational Checks – Start Aftertreatment Diagnostics Here
Step
Action
Decision
1
Verify the following engine systems are in satisfactory condition:
•
Engine Oil:
Park vehicle on level ground and check oil
level.
•
Engine Coolant Level:
Check coolant level that is
indicated on deaeration tank.
•
Intake Air:
Inspect air filter gauge, located on air filter
housing or dashboard.
•
Electrical System:
Inspect batteries and electrical
system (engine and vehicle) for poor or loose connections,
corroded terminals, or broken and damaged wires.
•
Exhaust System:
Check Aftertreatment and exhaust
system for damage, excessive corrosion, or leaks.
•
Fuel level:
Check instrument panel fuel gauge, look into
fuel tanks to verify fuel level, and make sure fuel levels are
equal in both tanks.
•
Fuel quality
Obtain a fuel sample, and check for water,
waxing, icing, sediment, gasoline, Diesel Exhaust Fluid
(DEF), or kerosene.
•
Fuel line routing and condition:
With engine OFF,
visually inspect the condition and routing of fuel lines.
Are all of the above engine systems operating as designed?
Yes: Go to step 2
No: Repair appropriate engine
system and then go to step 2.
Step
Action
Decision
2
Determine if engine or Aftertreatment system warning lamps
are illuminated. Key-On Engine-Off (KOEO), check Instrument
Panel (IP) for the following warning lamps:
•
Amber Warning Lamp (AWL)
•
Red Stop Lamp (RSL)
•
Malfunction Indicator Lamp (MIL)
•
Diesel Particulate Filter (DPF) Lamp
Are any of the above warning lamps illuminated?
Yes: Go to step 4
No: Go to step 3
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